8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 9091 Comm: syz.0.1179 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ab950>] lr : [<813ab940>] psr: 60000013 sp : df845d30 ip : df845d30 fp : df845d54 r10: 82b16f40 r9 : 00000003 r8 : 841dad80 r7 : df845d90 r6 : 841dad80 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e153a4 r1 : 00000001 r0 : 813ab5c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 830cd400 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 841dad80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841dad80 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdf844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.1179 (pid: 9091, stack limit = 0xdf844000) Stack: (0xdf845d30 to 0xdf846000) 5d20: 823fe498 841dad80 829cf96c 829cf96c 5d40: 81e15864 841dadc4 df845d8c df845d58 813a79e8 813ab7e8 200000c0 00000000 5d60: df845d7c 200000c0 841dad80 b5403587 200000c0 833be000 40946400 00000003 5d80: df845e4c df845d90 813a3568 813a78ec 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 000000eb 00010000 00000008 00000003 00000004 00000008 5dc0: 00000007 0000000a 00000100 00000002 00000001 fffffffe 00000031 00004006 5de0: 00000101 00000000 0801a449 00000003 40000004 00000089 0000caa3 000007ff 5e00: 20001e58 0000000b 00000e68 00000000 00000008 0000f9e8 00000000 fffffff8 5e20: 00000000 dfbb0018 00000000 8548da80 841dad80 200000c0 200000c0 833be000 5e40: df845f14 df845e50 813a4534 813a3474 00000000 00000000 00000000 dfbb0018 5e60: 00000000 00000000 8247054c 0000005f 83d85e58 841dadb0 84061324 833be000 5e80: df845ee4 df845e90 80797a24 8078dd88 00000064 00000001 00000000 df845eac 5ea0: 8591bf10 8342a2a8 00006400 0000000b df845ea0 00000000 00000000 dfbb0018 5ec0: 8548da80 40946400 200000c0 200000c0 8548da80 00000005 df845ef4 df845ee8 5ee0: 80797b44 dfbb0018 df845f14 40946400 00000000 8548da81 200000c0 8548da80 5f00: 00000005 833be000 df845fa4 df845f18 8056cd68 813a3f64 ecac8b10 833be000 5f20: df845f3c df845f30 81a39a78 81a39948 df845f54 df845f40 8025e490 8028ef64 5f40: df845fb0 40000000 df845f84 df845f58 802229ec 8025e44c 00000000 8281cddc 5f60: df845fb0 0014c820 ecac8b10 80222940 00000000 dfbb0018 df845fac 00000000 5f80: 00000000 002f6448 00000036 8020029c 833be000 00000036 00000000 df845fa8 5fa0: 80200060 8056cc44 00000000 00000000 00000005 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76f480bc 5fe0: 76f47ec0 76f47eb0 0001948c 001322c0 60000010 00000005 00000000 00000000 Call trace: [<813ab7dc>] (parport_attach) from [<813a79e8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:841dadc4 r5:81e15864 r4:829cf96c [<813a78e0>] (comedi_device_attach) from [<813a3568>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:833be000 r7:200000c0 r6:b5403587 r5:841dad80 r4:200000c0 [<813a3468>] (do_devconfig_ioctl) from [<813a4534>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:833be000 r7:200000c0 r6:200000c0 r5:841dad80 r4:8548da80 [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3f58>] (comedi_unlocked_ioctl) from [<8056cd68>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:833be000 r9:00000005 r8:8548da80 r7:200000c0 r6:8548da81 r5:00000000 r4:40946400 [<8056cc38>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf845fa8 to 0xdf845ff0) 5fa0: 00000000 00000000 00000005 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76f480bc 5fe0: 76f47ec0 76f47eb0 0001948c 001322c0 r10:00000036 r9:833be000 r8:8020029c r7:00000036 r6:002f6448 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction